CN101917345A - Method and device for controlling flows in wireless local area network - Google Patents
Method and device for controlling flows in wireless local area network Download PDFInfo
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- CN101917345A CN101917345A CN2010102688728A CN201010268872A CN101917345A CN 101917345 A CN101917345 A CN 101917345A CN 2010102688728 A CN2010102688728 A CN 2010102688728A CN 201010268872 A CN201010268872 A CN 201010268872A CN 101917345 A CN101917345 A CN 101917345A
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Abstract
The invention discloses a method and a device for controlling flows in a wireless local area network. The method is applied to an access point AP which is connected to a plurality of wireless terminals and comprises the following steps: confirming a flow sending level of the wireless terminal through the access point according to the working status of the wireless terminal and sending a report to the wireless terminal through the access point according to the flow sending level of the wireless terminal. The invention increases the use ratio of the channel of the wireless local area network.
Description
Technical field
The present invention relates to the communications field, relate in particular to flow control methods and equipment in a kind of WLAN (wireless local area network).
Background technology
WLAN (Wireless Local Area Network, WLAN (wireless local area network)) provides a kind of wireless connections service of local area network (LAN), and wireless data access at a high speed can be provided in small range, is present a kind of wireless access way that is widely adopted.AP (Access Point, access point) is an important composition equipment of WLAN (wireless local area network), be a wireless transmitting-receiving equipments: will become wireless signal to send from the data transaction that cable network (for example Internet) receives, the wireless signal that receives is converted to data and is forwarded to cable network.
According to the WLAN protocol definition, have only three channels that do not conflict to use simultaneously in the 2.4GHZ frequency range, for example 1,6 and 11, wherein the performance that can carry of each channel is exactly at most 20Mbps.In the wlan network of intensive access, need to install the network demand that a large amount of AP equipment could satisfy numerous wireless terminal users, so also just caused in a channel to have a large amount of wlan devices, these all wlan devices will be divided into the 20Mbps performance of this channel.
In numerous wireless clients of under AP, hanging, the wireless client distance A P equipment distant (just the visible signal between AP and the wireless client is poor) that part may occur, in order to guarantee effective arrival of data, these wireless clients may adopt lower transmission rate to carry out data and send.For example, the greatest physical transmission rate that the 802.11g agreement can be supported is 54Mbps, but under the situation distant when distance, that signal is poor or environment is poor, wireless client may select low rate 11Mbps even 1Mbps to carry out the data transmission.
Because any wireless client is consume channel performance in large quantities all, for example BT download, sudden peal of thunder download etc., in order to guarantee that whole wlan network can provide stable access service, a kind of flow control mode is provided in the prior art, carry out Limit Rate at inserting the user, control the flow that each wireless terminal can not surpass appointment.The maximum flow that each wireless access subscriber for example can be set is 2Mbps, that is to say that AP equipment can directly abandon the data that surpass if the flow of wireless terminal surpasses 2Mbps.Another kind of flow control mode is provided in the prior art, a flow of eating dishes without rice or wine to support is set, 15Mbps for example, when a wireless terminal was arranged on this is eated dishes without rice or wine, this terminal can exclusively enjoy this 15Mbps bandwidth; But when 5 wireless terminals were arranged on this is eated dishes without rice or wine, each wireless terminal used the 3Mbps bandwidth at most.
But if the poor wireless terminal transmission lot of data of signal is arranged, the consume channel performance that this wireless terminal can be a large amount of is unfavorable for that the channel of the reasonable wireless terminal of other signals uses, and the channel service efficiency is low.
Summary of the invention
The invention provides flow control methods and equipment in a kind of WLAN (wireless local area network), improved the channel service efficiency of WLAN.
The invention provides the flow control methods in a kind of WLAN (wireless local area network), be applied to down hang the access point AP of a plurality of wireless terminals, comprising:
Access point determines that according to the operating state of wireless terminal the flow of wireless terminal sends rank;
Described access point sends message according to the flow transmission rank of wireless terminal to wireless terminal.
Described access point is determined according to the operating state of wireless terminal also to comprise before the flow transmission rank of wireless terminal:
Described access point will arrive the buffer queue of described wireless terminal to the packet buffer that wireless terminal sends.
Described access point comprises to wireless terminal transmission message according to the flow transmission rank of wireless terminal:
Described access point is searched corresponding transmission message according to the flow transmission rank of current wireless terminal and is counted N, N message of buffer memory in the array cache of transmission current wireless terminal, and different flow sends the corresponding different transmission message of rank and counts N.
Described access point comprises to wireless terminal transmission message according to the flow transmission rank of wireless terminal:
Described access point is that the array cache of wireless terminal distributes the message of predetermined bit to send sign;
Described access point sends sign according to the message that flow sends the current bit of each wireless terminal of rank circulation identification, if this bit sign allows to send message, then send the message of storing in the array cache, discern the described current bit that next flow sends other wireless terminal of level to described current wireless terminal; If this bit sign does not send message, then next flow of Direct Recognition sends the described current bit of other wireless terminal of level; After the message of the current bit of all wireless terminals of identification sent sign, the message that sends next bit of each wireless terminal of rank circulation identification according to flow sent sign.
The operating state of described wireless terminal comprise following one or more:
The history of the message of transmission rate, signal strength signal intensity, transmission retransmits situation, sends the packet drop of message.
Each wireless terminal has a plurality of buffer queues, respectively the message of the different priorities of this wireless terminal of buffer memory.
The invention provides a kind of access point, comprising:
Receiving element is used to receive the message that sends to wireless terminal;
The rank determining unit is used for determining that according to the operating state of wireless terminal the flow of wireless terminal sends rank;
Transmitting element is connected with described rank determining unit, is used for sending the message that rank is sent in the array cache buffer memory according to the flow of wireless terminal.
Also comprise:
Buffer unit is connected with transmitting element with described receiving element, and the packet buffer that is used for sending to wireless terminal arrives the buffer queue of described wireless terminal.
Described transmitting element comprises:
Search subelement, the transmission message that is used for sending according to the flow of wireless terminal the array cache correspondence of rank circulation searching wireless terminal is counted N,
Send subelement, is connected, be used for searching N the message that transmission message that subelement finds is counted the array cache buffer memory of N transmission wireless terminal according to described with the described subelement of searching.
Described transmitting element comprises:
The sign subelement is used to the array cache of wireless terminal to distribute the message of predetermined bit to send sign;
The recognin unit, be connected with described sign subelement, be used for sending the message transmission sign of the current bit of each wireless terminal of rank circulation identification according to flow, and after the message of the current bit of all wireless terminals of identification sent sign, the message that sends next bit of each wireless terminal of rank circulation identification according to flow sent sign;
Send subelement, be connected, be used for when described recognin unit identification bit sign allows to send message, sending the message of storing in this wireless terminal array cache to wireless terminal with described recognin unit.
The operating state of described wireless terminal comprise following one or more:
The history of the message of transmission rate, signal strength signal intensity, transmission retransmits situation, sends the packet drop of message.
Each wireless terminal has a plurality of buffer queues, respectively the message of the different priorities of this wireless terminal of buffer memory.
Compared with prior art, the present invention has the following advantages at least:
Access point carries out flow according to the flow transmission rank of wireless terminal and sends, and avoids the poor wireless terminal transferring large number of data of signal to cause a large amount of consume channel performances, improves WLAN stability.
Description of drawings
Fig. 1 is the flow control methods schematic flow sheet in the WLAN (wireless local area network) provided by the invention;
Fig. 2～5th, the structural representation of access point provided by the invention.
Embodiment
The invention provides the flow control methods in a kind of WLAN (wireless local area network), be applied to down hang the access point AP of a plurality of wireless terminals, the packet buffer that AP will send to wireless terminal is to the buffer queue of wireless terminal, and determine that according to the operating state of wireless terminal the flow of wireless terminal sends rank, the flow according to wireless terminal sends the message that rank is sent in buffer memory in the array cache then.
Flow control methods in the WLAN (wireless local area network) provided by the invention as shown in Figure 1, may further comprise the steps:
When AP receives from network need be after the data that wireless terminal sends, be not directly to send but be cached to earlier in the buffer queue of terminal oneself to eating dishes without rice or wine.Can design one or more buffer queue for each wireless terminal according to actual conditions in actual applications, for example can design a plurality of formations, realize message classification buffer memory for different priority.The size of buffer queue can be according to the empirical data definition of the internal memory situation of equipment or practical application, 128 messages of each buffer queue largest buffered for example, and total buffer memory message of all wireless terminals is 1024 to the maximum.Preferably, AP stores according to the order of configuration during stored messages in array cache successively, if current memory location is last position, then next memory location is initial position, the array cache of supposing a wireless terminal is 16bit, and AP initial storage message is at the 1-10bit of array cache, and next message should be stored in 11bit, storage is backward successively stored into behind the 16bit and is continued the circulation storage from 1bit again.
Concrete, when the flow of AP dynamic evaluation wireless terminal sends rank, employed parameter comprise following one or more: the history of the message of transmission rate, signal strength signal intensity, transmission retransmits situation, sends the packet drop of message.
Transfer of data in the wireless WLAN LAN is unlike the transfer of data in the common lan network, and all messages all use identical speed to send.The equipment entity of any one WLAN all can be supported a cover transmission rate collection, selects a speed to carry out data according to the assessment of reality when needs send data and sends, for example 802.11b support 1,2,5.5 and 11Mbps speed.
Need to prove needed running parameter during the operating state of a wireless terminal of restriction analysis not in the embodiment of the invention.AP defines the transmission rank of this client traffic according to the operating state of wireless terminal, according to this transmission rank the message of wireless client is sent then and controls and shaping.Determine that according to the transmission rate of wireless terminal it is that example is said that the flow of wireless terminal sends rank, needs this mode of explanation only as a kind of specific implementation, and does not limit mode of operation provided by the invention with AP below:
AP is that 1-16 of wireless client definition sends rank, respectively from 1 to 16, wherein 16 represent the highest transmission rank (being defined as full transmission rank here), other rank all produces with respect to rank 16, for example, when the terminal of rank 16 sent 16 messages, the terminal of rank 14 only can send 14 messages, and the terminal of rank 10 can only send 10 messages;
AP uses for reference the computing mechanism of rate selection algorithm, the data transmission rate of regular assessment wireless terminal, and obtain " flow transmission rank " according to this transmission rate, for example wireless client carries out data with 54Mbps speed all the time and sends then definition to send rank be 16; And wireless client on average use 36Mbps speed to send can to define the method rank be 12; And if wireless client poor signal or operating state may always send to be lower than 11Mbps speed when bad, then can define and send rank is 4.
Concrete, other wireless terminal of AP control different flow transmission level sends message in a period of time flow varies in size, and the flow of the message that the wireless terminal that for example rank is high sends is big, and the flow of the message that the wireless terminal that rank is low sends is little.Realize that the mode of this effect can be according to actual needs determines flexibly, for example can pre-defined each rank corresponding flow value, send the message of corresponding wireless terminal then successively according to the rank size.AP can also distribute the message of predetermined bit to send sign for the array cache of wireless terminal; AP sends sign according to the message that flow sends the current bit of each wireless terminal of rank circulation identification, if this bit sign allows to send message, then send the message of storing in the array cache, discern this current bit that next flow sends other wireless terminal of level to the current wireless terminal; If this bit sign does not send message, then next flow of Direct Recognition sends this current bit of other wireless terminal of level; After the message of the current bit of all wireless terminals of identification sent sign, the message that sends next bit of each wireless terminal of rank circulation identification according to flow sent sign.
For the flow control methods in the WLAN (wireless local area network) provided by the invention clearly is described, provided the concrete control implementation of a cover below, still, provided by the inventionly be not limited only to following implementation.
At first, AP is the sign of distributing a 16bits in the array cache of each wireless terminal, and whether this wireless client can send the message (for example message of specified quantity) of appointment under each bit bit representation present case.
Secondly, AP regularly carries out flow to all wireless terminals and sends the rank assessment, and the flow according to wireless terminal sends the message transmission sign that the rank assessment result is provided with wireless terminal then.For example, AP sends the rank assessment result according to the flow of wireless terminal the sign of wireless terminal is dyeed, suppose that 16 all bit positions of wireless client of rank 16 all dye, all do not dye in other bit positions and the 8th and the 16th sign of the wireless client of rank 14 do not dye, the wireless client of rank 4 have only 1,5,9 and the 13bit position dye.
At last, in wireless terminal transmission message, preferentially the flow transmission rank (from high to low) according to wireless terminal circulates at AP, circulates according to the sign position then and carries out the data transmission.Concrete, AP is provided with global information record tmpbit when the bit position of pre-treatment, and initialization can be 1; All wireless terminals circulate, for each wireless terminal, only judge the bit position of tmpbit appointment, if this bit position is dyed and the array cache of this wireless terminal in store the data of this wireless terminal, then the data with this wireless terminal send, and continue the processing of next wireless terminal then; Otherwise directly enter the processing of next wireless terminal; After all terminal circular treatment are finished, tmpbit is moved, if tmpbit has been 16 then tmpbit is set is 1, otherwise tmpbit=tmpbit+1.Need to prove, at AP when wireless terminal sends message, the flow that can also adjust flexibly according to actual needs according to wireless terminal sends the order that rank sends message, for example can send rank sequential loop from low to high according to the flow of wireless terminal and send message.
By method provided by the invention, the packet buffer that AP will send to wireless terminal is to the buffer queue of wireless terminal, flow according to wireless terminal sends the transmission of rank control flow, avoid the poor wireless terminal transferring large number of data of signal to cause a large amount of consume channel performances, improved WLAN stability.
The invention provides a kind of access point, as shown in Figure 2, comprising:
Receiving element 11 is used to receive the message that sends to wireless terminal;
Transmitting element 14 is connected with described rank determining unit 13, is used for sending the message that rank is sent in the array cache buffer memory according to the flow of wireless terminal.
As shown in Figure 3, this access point also comprises buffer unit 12, is connected with described receiving element 11, is used for the packet buffer that will send to the wireless terminal buffer queue to wireless terminal.
As shown in Figure 4, described transmitting element comprises:
Search subelement 141, the transmission message that is used for sending according to the flow of wireless terminal the array cache correspondence of rank circulation searching wireless terminal is counted N,
Send subelement 142, is connected, be used for searching N the message that transmission message that subelement finds is counted the array cache buffer memory of N transmission wireless terminal according to described with the described subelement 141 of searching.
Perhaps as shown in Figure 5, described transmitting element 14 comprises:
Sign subelement 143 is used to the array cache of wireless terminal to distribute the message of predetermined bit to send sign;
Send subelement 145, be connected, be used for when described recognin unit 144 identification bit signs allow to send message, sending the message of storing in this wireless terminal array cache to wireless terminal with described recognin unit 144.
The operating state of described wireless terminal comprise following one or more: the history of the message of transmission rate, signal strength signal intensity, transmission retransmits situation, sends the packet drop of message.
Each wireless terminal has a plurality of buffer queues, respectively the message of the different priorities of this wireless terminal of buffer memory.
Among the present invention, the packet buffer that access point will send to wireless terminal is to the buffer queue of wireless terminal, carrying out flow according to the flow transmission rank of wireless terminal sends, thereby avoid the poor wireless terminal transferring large number of data of signal to cause a large amount of consume channel performances, improve WLAN stability.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (12)
1. the flow control methods in the WLAN (wireless local area network) is applied to down hang the access point AP of a plurality of wireless terminals, it is characterized in that, comprising:
Access point determines that according to the operating state of wireless terminal the flow of wireless terminal sends rank;
Described access point sends message according to the flow transmission rank of wireless terminal to wireless terminal.
2. the method for claim 1 is characterized in that, described access point is determined according to the operating state of wireless terminal also to comprise before the flow transmission rank of wireless terminal:
Described access point will arrive the buffer queue of described wireless terminal to the packet buffer that wireless terminal sends.
3. method as claimed in claim 2 is characterized in that, described access point comprises to wireless terminal transmission message according to the flow transmission rank of wireless terminal:
Described access point is searched corresponding transmission message according to the flow transmission rank of current wireless terminal and is counted N, N message of buffer memory in the array cache of transmission current wireless terminal, and different flow sends the corresponding different transmission message of rank and counts N.
4. method as claimed in claim 2 is characterized in that, described access point comprises to wireless terminal transmission message according to the flow transmission rank of wireless terminal:
Described access point is that the array cache of wireless terminal distributes the message of predetermined bit to send sign;
Described access point sends sign according to the message that flow sends the current bit of each wireless terminal of rank circulation identification, if this bit sign allows to send message, then send the message of storing in the array cache, discern the described current bit that next flow sends other wireless terminal of level to described current wireless terminal; If this bit sign does not send message, then next flow of Direct Recognition sends the described current bit of other wireless terminal of level; After the message of the current bit of all wireless terminals of identification sent sign, the message that sends next bit of each wireless terminal of rank circulation identification according to flow sent sign.
5. the method for claim 1 is characterized in that, the operating state of described wireless terminal comprise following one or more:
The history of the message of transmission rate, signal strength signal intensity, transmission retransmits situation, sends the packet drop of message.
6. as each described method of claim 2-4, it is characterized in that each wireless terminal has a plurality of buffer queues, respectively the message of the different priorities of this wireless terminal of buffer memory.
7. an access point is characterized in that, comprising:
Receiving element is used to receive the message that sends to wireless terminal;
The rank determining unit is used for determining that according to the operating state of wireless terminal the flow of wireless terminal sends rank;
Transmitting element is connected with described rank determining unit, is used for sending message according to the flow transmission rank of wireless terminal to wireless terminal.
8. access point as claimed in claim 7 is characterized in that, also comprises:
Buffer unit is connected with transmitting element with described receiving element, and the packet buffer that is used for sending to wireless terminal arrives the buffer queue of described wireless terminal.
9. access point as claimed in claim 8 is characterized in that, described transmitting element comprises:
Search subelement, the transmission message that is used for sending according to the flow of wireless terminal the array cache correspondence of rank circulation searching wireless terminal is counted N,
Send subelement, is connected, be used for searching N the message that transmission message that subelement finds is counted the array cache buffer memory of N transmission wireless terminal according to described with the described subelement of searching.
10. access point as claimed in claim 8 is characterized in that, described transmitting element comprises:
The sign subelement is used to the array cache of wireless terminal to distribute the message of predetermined bit to send sign;
The recognin unit, be connected with described sign subelement, be used for sending the message transmission sign of the current bit of each wireless terminal of rank circulation identification according to flow, and after the message of the current bit of all wireless terminals of identification sent sign, the message that sends next bit of each wireless terminal of rank circulation identification according to flow sent sign;
Send subelement, be connected, be used for when described recognin unit identification bit sign allows to send message, sending the message of storing in this wireless terminal array cache to wireless terminal with described recognin unit.
11. access point as claimed in claim 7 is characterized in that, the operating state of described wireless terminal comprise following one or more:
The history of the message of transmission rate, signal strength signal intensity, transmission retransmits situation, sends the packet drop of message.
12. as each described access point of claim 8-10, it is characterized in that each wireless terminal has a plurality of buffer queues, respectively the message of the different priorities of this wireless terminal of buffer memory.
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| CN2010102688728A CN101917345A (en) | 2010-09-01 | 2010-09-01 | Method and device for controlling flows in wireless local area network |
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| CN2010102688728A CN101917345A (en) | 2010-09-01 | 2010-09-01 | Method and device for controlling flows in wireless local area network |
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Application publication date: 20101215 |